linux-kernel - splice_read() for device drivers?

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Message-ID: <c384c5ea0904190909i1b5ec8car615fdc76e302b871@mail.gmail.com>
Date:	Sun, 19 Apr 2009 18:09:44 +0200
From:	Leon Woestenberg <leon.woestenberg@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: splice_read() for device drivers?

Hello,

I have a device driver for data acquisition that currently exposes a
character device. The device driver performs DMA transfers directly
into/from user space on read/write().

If I want the driver to support splicing, must I implement
splice_read/write() ops? Can I make them directly DMA into the splice
pipe buffer pages?

I found no current implementation of splice_read/write(), except for
filesystem drivers.

Is there a write-up on this or a reference implementation? Any work in
progress for LDD4 or such?

Regards,
-- 
Leon
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